There is a second human bias that causes you to cache an unrealistically high summary statistic for how often you change your mind: you think you change your mind, in general, pretty often, but unless you are an expert, highly-practiced rationalist, odds are that you do not. As evidence, try thinking of the last time you changed your mind about something and force yourself to specify what you believed beforehand and what you believed afterward. Me personally, I haven't changed my mind about anything that I can remember since about November 10th, 2010, and I'm sure I've expressed thousands of opinions since then. The odds are long.

It is interesting to hear you say that. I would not go as far as to contradict you but I would be equally unsurprised to find out that I changed my mind more than I thought I did. This too is a human bias that crops up all the time, albeit in different circumstances. People are quite capable of completely changing their beliefs to a new belief that they sincerely believe they had all along.

This is a miscalibration that can go either way depending on which way the ego is pulling at the time.